She is putting herself in my orbit by asking questions and asking if acupuncture works for headaches (i study acupuncture). Would you offer it or would you wait until she asks for it?Don't do anything. Enjoy your life and she will pick up on this. It's not uncommon that she starts gravitating towards another dude. His wifi-signal may be stronger than yours at this moment. Women always connect to the strongest signal.
But get this, most men don't know the first thing about women. If he starts to fall for her he'll make a lot of mistakes and his signal won't be as strong anymore. So, make sure yours didn't show any signs of neediness or weakness while she was flirting and dating that other fellow.
As I said, she will pick up on your mindset and frame and won't forget this when things go south with mister loverboy. She'll start to wonder.. how is PM856 doing (I hope she doesn't call you this btw).. haven's heard of seen him in a while and according to his FB and instragram he's having a lot of fun.
This is your only chance at getting her back man. Chasing is losing. A rabbit always runs from the hunter. Showing any signs that she got to you by hooking up with that other guy will lower her attraction for you aswell. She wants a man who knows he can replace her at any time.
Hope this helps